For Companies Best and Aplus, each earns an annual profit that is normally distributed with the same positive mean μ. The standard deviation of Best's annual profit is one third of its mean. In a certain year, the probability that Aplus makes a loss (i.e. a negative profit) is 0.8 times the probability that Best does. Assuming that Aplus' annual profit has a standard deviation of 10, please compute (approximately) the standard deviation of Best's annual profit.

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